Chery T21 2014 Service Manual page 443

d. Disconnect all fuel injector connectors.
e. Remove the spark plug
f. Slowly screw the cylinder pressure gauge joint
vertically into the spark plug hole. Do not tighten it
excessively to prevent difficult removal.
CAUTION
 DO NOT screw cylinder pressure gauge excessively to prevent difficult removal.
g. With transmission in neutral position, release the accelerator pedal fully, then start the engine and keep
it racing for 3 to 5 seconds to record the measured pressure value.
h. Press the bleeder button of cylinder pressure gauge to reset it to zero. Measure three times in the same
way and take the average.
Standard value for cylinder pressure: 10 - 13.5 bar
CAUTION
 During measurement, do not turn ignition switch to "START" for more than 10 seconds. Otherwise the
engine may be damaged.
 Ensure that battery is fully charged when cranking engine. Correct cylinder pressure can be measured
only when engine is running at 180 - 250 r/min.
 Use the same method to measure pressure of other cylinders.
Cylinder Pressure Value Judgement
 Correct cylinder pressure
Standard cylinder pressure value is between 10 and 13.5 bar and will drop slightly with the using of
engine. But the lowest value cannot be below 9 bar and the pressure difference between each
cylinder should not be above 3 bar.
 If cylinder pressure of engine is lower than the standard value, it indicates that cylinder pressure is
insufficient. Add a small amount of engine oil through spark plug hole and perform measurement
again.
If pressure increases after adding oil, the piston ring or cylinder bore may be worn or damaged.
If pressure remains low, the valve may be stuck or not properly installed or there is air leakage from
cylinder head gasket.
i. Install the spark plug
j. Connect all fuel injector connectors
k. Install the high-voltage cables.
Chery Automobile Co., Ltd.
(See page 14-12).
(See page 14-12).
(See page
07 - SQR484F ENGINE MECHANICAL
08-26).
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